diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 0000000..fad066f
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+2.5.0
\ No newline at end of file
diff --git a/Gemfile.lock b/Gemfile.lock
index 5786bd2..c436812 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,56 +1,64 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.3.8)
-    colorator (0.1)
-    concurrent-ruby (1.0.1)
-    execjs (2.6.0)
-    fastimage (1.9.0)
-      addressable (~> 2.3.5)
-    ffi (1.9.10)
+    addressable (2.5.0)
+      public_suffix (~> 2.0, >= 2.0.2)
+    colorator (1.1.0)
+    concurrent-ruby (1.0.5)
+    execjs (2.7.0)
+    extras (0.1.0)
+      forwardable-extended (~> 2.5)
+    fastimage (2.1.0)
+    ffi (1.9.18)
+    forwardable-extended (2.6.0)
     htmlentities (4.3.4)
-    jekyll (3.1.3)
-      colorator (~> 0.1)
+    jekyll (3.4.2)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 1.1)
       kramdown (~> 1.3)
       liquid (~> 3.0)
       mercenary (~> 0.3.3)
+      pathutil (~> 0.9)
       rouge (~> 1.7)
       safe_yaml (~> 1.0)
-    jekyll-assets (2.1.3)
-      fastimage (~> 1.8)
-      jekyll (~> 3.0)
-      sprockets (~> 3.3)
-      sprockets-helpers (~> 1.2)
-      tilt (~> 2.0)
-    jekyll-feed (0.5.1)
-    jekyll-sass-converter (1.4.0)
+    jekyll-assets (2.2.8)
+      extras (~> 0.1)
+      fastimage (~> 2.0, >= 1.8)
+      jekyll (~> 3.1, >= 3.0)
+      pathutil (>= 0.8)
+      rack (> 1, < 2)
+      sprockets (~> 3.3, < 3.7)
+    jekyll-feed (0.9.1)
+      jekyll (~> 3.3)
+    jekyll-sass-converter (1.5.0)
       sass (~> 3.4)
-    jekyll-sitemap (0.10.0)
-    jekyll-watch (1.4.0)
+    jekyll-sitemap (1.0.0)
+      jekyll (~> 3.3)
+    jekyll-watch (1.5.0)
       listen (~> 3.0, < 3.1)
-    kramdown (1.10.0)
+    kramdown (1.13.2)
     liquid (3.0.6)
-    listen (3.0.6)
-      rb-fsevent (>= 0.9.3)
-      rb-inotify (>= 0.9.7)
+    listen (3.0.8)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
     mercenary (0.3.6)
-    rack (1.6.4)
-    rake (11.1.2)
-    rb-fsevent (0.9.7)
-    rb-inotify (0.9.7)
+    pathutil (0.14.0)
+      forwardable-extended (~> 2.6)
+    public_suffix (2.0.5)
+    rack (1.6.5)
+    rake (12.0.0)
+    rb-fsevent (0.9.8)
+    rb-inotify (0.9.8)
       ffi (>= 0.5.0)
-    rouge (1.10.1)
+    rouge (1.11.1)
     safe_yaml (1.0.4)
-    sass (3.4.22)
-    sprockets (3.6.0)
+    sass (3.4.23)
+    sprockets (3.6.3)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    sprockets-helpers (1.2.1)
-      sprockets (>= 2.2)
-    tilt (2.0.2)
-    uglifier (3.0.0)
+    uglifier (3.1.7)
       execjs (>= 0.3.0, < 3)
 
 PLATFORMS
@@ -68,4 +76,4 @@ DEPENDENCIES
   uglifier
 
 BUNDLED WITH
-   1.11.2
+   1.13.7